Chill



(No Model.)

W. PAWGETT.

CHILL.

' No. 405,882. Patented June 25, 1889.

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UNITED STATES PATENT GEEICE.

XVILLIAM FAXVCETT, OF ROCHESTER, NEV YORK.

CHILL.

SPECIFICATION forming part of Letters Patent No. 405,882, dated June 25, 1889.

Application filed March 2 5, 1889.

To aZZ whmn it may concern:

Be it known that 1, WILLIAM FAwoET'r, a citizen of the United States of America, residin g at Rochester, in the county of Monroe and State of New York, have in vented certain new and useful Improvements in Chills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will en able others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to certain new and useful improvements in chills used in the manufacture of car or other wheels; and it consists in the special construction of the chill, whereby I am enabled to produce a wheel having a smooth periphery, the chill being so constructed that itwill be permitted to expand and contract without forming upon the wheel ridges or uneven spaces, which are injurious to the rail and noisy in use; and my invention further consists in a chill made up of several rings, each having vertical slits in their inner surfaces, and the rings being so arranged, when assembled to form a chill, that the slits of one ring will break joints with the slits of the rings adjacent. The rings are held together by an outside rigid clampingring, which prevents elongation or outward expansion of the chill, confining all movement by expansion toward the center, thus causing the inner surface of the chill to closely follow the casting as it shrinks in cooling, the rings forming the mold having openings which permit the heated air or gas to escape, all as will be hereinafter fully set forth and claimed.

In the accompanying drawings, Figure 1 is a perspective view of a chill constructed in accordance with my invention. Fig. 2 is a bottom view of a part of one of the rings. Fig. 3 is a sectional view taken through the line to 00 of Fig. 1.

The chill is preferably made of four castmetal sections or rings a, b, c, and cl, which are placed one upon another to make a mold of a proper depth, the inner and outer edges of said rings being provided with vertical Serial No. 304,580. (No model.)

flanges a, b, c, and (1, designed to keep the plates asunder, as shown in Fig. 3, in order that air may circulate between them. These rings are formed with spaces or open-ended slots 6, and between said slots or spaces with closed slots f, and when the rings are properly placed together these slots 6 and f lie over one anotherthat is to say, the slots c will lie directly above the slots f, and adjacent thereto t-he slots f above the slots 6, thus providing air-spaces through which the heated air can escape and cool air circulate. From the inner ends of slots f slits or cuts extend to the inner periphery of the rings, and these slits or openings, when the rings are placed together, break joints, as shown in Fig. 1. The rings or sections a, b, c, and d are held together by a band having trunnions formed thereon, said band being provided with inwardly-projecting plates or flanges, one of which may be bolted to the band,so they can overlap the edges of the rings or sections to hold them together.

A chill made up of separate rings, cast and divided, as shown and described, provides a chill in which each section is flexible, and as the joints break no two of the radial divisions come in contact with each other, and the outer or exterior clamping-ring is rigid, for the purpose of keeping the rings or sections from expanding outwardly, but permitting them to expand toward the center for the purpose of following up the shrinkage of the wheel as it cools. lVhen'the molten metal is poured into the mold or chill, two actions immediately set in. The outer portion of the casting, or the periphery of the wheel which is immediately adjacent to the inner face of the rings, solidifies, and the metal forming the center of the wheel parts with its heat and contracts away from the chill or mold, and as it does this the chill as ordinarily shaped absorbs the heat and expands away from the periphery of the wheel. The object of the flexible chill constructed as shown is to admit of expansion only toward the center. The outside or supporting ring a: being rigid keeps the rings from increasing in diameter, so that as the diameter of the casting decreases in cooling the interior diameter of the chill will decrease at the same rate, thus admitting of the wheel or castingbeing held snugly by the chill while cooling. By the use of such a mold the strength of the wheel is enhanced, as the metal can be poured into the mold at a higher degree of temperature and faster, and as all the openings from the slots to the inner periphery of the rings break joints no obstructions will be formed on the periphery of the wheel.

In my prior patent, as well as in the ordinary way of casting car-wheels, the peripheries thereof had obstructions thereon which proved objectionable, and which are entirely obviated by my improved construction.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. Achill consisting of a number of flanged plates resting one upon another, and each provided with slots to connect the air-spaces between the several plates, substantially as described.

2. A chill consisting of a number of plates provided on each edge with a flange, and having openings f between the flanges, slots 6 extending through the outer flange, and

kerfs or slits extending through the inner flanges to the openings f, substantially as described.

3. A chill consisting of a number of superposed plates having flanges effecting airspaces between them, and a ring embracing the periphery of the assembled plates, substantially as described.

4. A chill for wheels, consisting of a number of plates secured together, each provided in its inner edge with slits arranged to break WILLIAM FAWCETT.

Vitnesses:

ELE. LEAVENWORTH, HIRAM Woon. 

